T400® fiber is a new melt-spun elastic fiber from INVISTA™, based on multi-component technology that revolutionizes the comfort, hand, wrinkle resistance and easy care of contemporary fabrics. So innovative that the FTC, North America approved a new generic fiber subclass, Elasterell-p and European BISFA approved a new generic fiber subclass, Elastomultiester (EME) in recognition of the unique qualities of T400® fiber.